/*
 * SonarQube
 * Copyright (C) 2009-2023 SonarSource SA
 * mailto:info AT sonarsource DOT com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package org.sonar.api.batch.fs.internal.charhandler;

public class LineOffsetCounter extends CharHandler {
  private long currentOriginalLineStartOffset = 0;
  private long currentOriginalLineEndOffset = 0;
  private final IntArrayList originalLineStartOffsets = new IntArrayList();
  private final IntArrayList originalLineEndOffsets = new IntArrayList();
  private long lastValidOffset = 0;

  public LineOffsetCounter() {
    originalLineStartOffsets.add(0);
  }

  @Override
  public void handleAll(char c) {
    currentOriginalLineStartOffset++;
  }

  @Override
  public void handleIgnoreEoL(char c) {
    currentOriginalLineEndOffset++;
  }

  @Override
  public void newLine() {
    if (currentOriginalLineStartOffset > Integer.MAX_VALUE) {
      throw new IllegalStateException("File is too big: " + currentOriginalLineStartOffset);
    }
    originalLineStartOffsets.add((int) currentOriginalLineStartOffset);
    originalLineEndOffsets.add((int) currentOriginalLineEndOffset);
    currentOriginalLineEndOffset = currentOriginalLineStartOffset;
  }

  @Override
  public void eof() {
    originalLineEndOffsets.add((int) currentOriginalLineEndOffset);
    lastValidOffset = currentOriginalLineStartOffset;
  }

  public int[] getOriginalLineStartOffsets() {
    return originalLineStartOffsets.trimAndGet();
  }

  public int[] getOriginalLineEndOffsets() {
    return originalLineEndOffsets.trimAndGet();
  }

  public int getLastValidOffset() {
    if (lastValidOffset > Integer.MAX_VALUE) {
      throw new IllegalStateException("File is too big: " + lastValidOffset);
    }
    return (int) lastValidOffset;
  }

}
